ClearOS is an integrated network server gateway solution for small and distributed organizations. The software provides all the necessary server tools to run an organization including email, anti-virus, anti-spam, file sharing, groupware, VPN, firewall, intrusion detection/prevention, content filtering, bandwidth management, multi-WAN, and more. You can think of it as a next generation small business server. Through the intuitive Web-based management console, an administrator can configure the server software along with integrated cloud-based services.

GNU parallel is a shell tool for executing jobs in parallel locally or using remote computers. A job is typically a single command or a small script that has to be run for each of the lines in the input. The typical input is a list of files, a list of hosts, a list of users, a list of URLs, or a list of tables. If you use xargs today you will find GNU parallel very easy to use, as GNU parallel is written to have the same options as xargs. If you write loops in shell, you will find GNU parallel may be able to replace most of the loops and make them run faster by running several jobs in parallel. GNU parallel makes sure output from the commands is the same output as you would get had you run the commands sequentially. This makes it possible to use output from GNU parallel as input for other programs.

Ingo is an email-filter management application. It
is fully internationalized, integrated with Horde
and the IMP Webmail client, and supports both
server-side (Sieve, procmail, maildrop) and client-side
(IMAP) rule creation.

MIMEDefang is a flexible MIME email scanner designed to do all kinds of email processing, including anti-virus scanning, anti-spam scanning, replacing parts of messages with URLs, adding boilerplate disclaimers, and so on. It can alter or delete various parts of a MIME message according to a Perl-based policy filter. It can also bounce messages with unacceptable attachments and modify SMTP response codes on the fly. It works with the Sendmail 8.11 and newer "Milter" API, which makes it more flexible and efficient than procmail-based approaches.

PHP MIME Mail decoder class is a PHP class to parse and decode MIME email messages. It supports decoding single RFC 2822 MIME messages or archives that aggregate multiple messages in the mbox format. It can decode messages read from files or data strings. The bodies of multipart messages can be decoded into distinct sub-messages. Optionally, the message body data can be saved to separate files, so the class can handle messages larger than the available memory. The parser can tolerate some syntax errors in malformed messages that are not compliant with RFC 2822.

Clam AntiVirus is an anti-virus toolkit designed especially for email
scanning on mail gateways. It provides a number of utilities, including
a flexible and scalable multi-threaded daemon, a commandline scanner,
and a tool for automatic database updates. The core of the package is an
anti-virus engine available as a shared library.

ffe is a flat file extractor. It can be used for reading different flat file structures and displaying them in different formats. ffe can read fixed length and separated text files and fixed length binary files. It is a command line tool developed under GNU/Linux. The main areas of use are extracting particular fields or records from a flat file, converting data from one format to an other, e.g. from CSV to fixed length, verifying a flat file structure, as a testing tool for flat file development, and displaying flat file content in human readable form.

htmLawed is a PHP script that makes input text
more secure, HTML standards-compliant, and
suitable in general from the viewpoint of a
Web-page administrator, for use in the body of
HTML 4 or XHTML 1 or 1.1 documents. It is a
customizable HTML/XHTML filter, processor,
purifier, and sanitizer. It can ensure that HTML
tags are balanced and properly nested tags,
neutralize code that may be used for cross-site
scripting (XSS) attacks, and limit the allowed
HTML elements, tags, attributes, or URL protocols.

Horde Groupware Webmail Edition is an enterprise
ready browser-based communication suite. Users can
read, send, and organize email messages and manage
and share calendars, contacts, tasks, and notes
with the standards compliant components from the
Horde Project. It bundles the separately available
applications IMP, Ingo, Kronolith, Turba, Nag, and
Mnemo. It can be extended with any of the released
Horde applications or the Horde modules that are
still in development, like a file manager, a
bookmark manager, a forum, or a wiki.